diff --git a/crates/ruff_db/src/testing.rs b/crates/ruff_db/src/testing.rs
index c32c57d37c..df35d6aec5 100644
--- a/crates/ruff_db/src/testing.rs
+++ b/crates/ruff_db/src/testing.rs
@@ -213,6 +213,7 @@ impl Default for LoggingBuilder {
     }
 }
 
+#[must_use = "Dropping the guard unregisters the tracing subscriber."]
 pub struct LoggingGuard {
     _guard: tracing::subscriber::DefaultGuard,
 }